Filling composition



U N t T" E D T T E PTENT OFFICE.

WALTER A. BRUNO, 015 LOS ANGELES, CALIFORNIA.

Patented May 25, 192d.

FILLING COMPOSITION.

1,341,54 0 Specification of Letters Patent.

No Drawing". Application filed September 8, 1919. Serial No. 322,304.

To all whom it may concern Be it known that I, WALTER A. BRUNO, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and ,State of California, have invented new and useful Improvements in Filling Compositions, of which the following is a specification.

This invention relates .to the art of filling holes or cracks in castings and the like.

An object of the present invention is the provision of a composition for the above purpose, which is in the form of metallic putty and when applied will quickly harden and adhere to the casting, after which it may be finished by means of a file, so as to have the appearance of the remainder of the casting.

A further object is the provision of a composition in which the binder will not oxidize and pass off into the atmosphere, to leave holes in the filling, and which in addition will be impervious to water or oil and is non-abrasive. In filling compositions which employ sulfur as a hinder, the latter is lacking in hardness and will oxidize or rust, with the result that the filling quickly becomes filled with small holes.

The present composition consists of the following ingredients combined in the proportions stated, viz:

4 parts powdered aluminum,

1 part powdered graphite,

6 parts powdered shellac (orange gum).

These ingredients are thoroughly mixed and subjected to heat until the mixture becomes of the consistency of dough when. it may be applied with the usual putty knife or like instrument. Two or three minutes are required for hardening after which it may be finished by means of a file or other suitable method so as to have the appearance of the remainder of the casting. By the use of shellac as a binder, the filling is more durable and is harder when set and it has not the undesirable odor of sulfur when being applied. Also, by the use of shellac as a binder, the filling will not oxidize. The aluminum powder is used principally to color the composition. It may be applied to a finished casting of any kind, and by the use of a little skill the filling cannot be detected. It contains the further advantage of being water and oil proof and is not abrasive and will not oxidize or rust. It is adhesive to either wood or metal. As graphite responds readily to the polishing process, a superior finish may be obtained. A still higher finish may be obtained by dipping the end of the finger in the powdered aluminum and rubbing it over the filling spot and finishing with a smooth piece of flexible steel. The composition may be, if desired, molded into strips of difierent sizes, for example, four inches in length, three-sixteenths of an inch thick and one-half inch wide, this being the most economical and convenient shape for use.

I claim:

1. The herein described composition of matter, consisting of powdered aluminum, powdered graphite and powdered shellac.

2. The herein described composition of matter consisting of four parts powdered aluminum, one part powdered graphite and six parts powdered shellac.

In testimony whereof I aifix my signature.

. WALTER A. BRUNO. 

